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mtd: nand: add lock/unlock routines

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Add nand lock / unlock routines. At least 'micron' parts
support this.

Signed-off-by: Vimal Singh <vimalsingh@ti.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Vimal Singh 2010-02-08 15:50:49 +05:30 committed by David Woodhouse
parent 6fe5a6acdc
commit 7d70f334ad
2 changed files with 174 additions and 0 deletions
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164
drivers/mtd/nand/nand_base.c
View File

@ -863,6 +863,168 @@ static int nand_wait(struct mtd_info *mtd, struct nand_chip *chip)
return status;
}
/**
* __nand_unlock - [REPLACABLE] unlocks specified locked blockes
*
* @param mtd - mtd info
* @param ofs - offset to start unlock from
* @param len - length to unlock
* @invert - when = 0, unlock the range of blocks within the lower and
* upper boundary address
* whne = 1, unlock the range of blocks outside the boundaries
* of the lower and upper boundary address
*
* @return - unlock status
*/
static int __nand_unlock(struct mtd_info *mtd, loff_t ofs,
uint64_t len, int invert)
{
int ret = 0;
int status, page;
struct nand_chip *chip = mtd->priv;
/* Submit address of first page to unlock */
page = ofs >> chip->page_shift;
chip->cmdfunc(mtd, NAND_CMD_UNLOCK1, -1, page & chip->pagemask);
/* Submit address of last page to unlock */
page = (ofs + len) >> chip->page_shift;
chip->cmdfunc(mtd, NAND_CMD_UNLOCK2, -1,
(page | invert) & chip->pagemask);
/* Call wait ready function */
status = chip->waitfunc(mtd, chip);
udelay(1000);
/* See if device thinks it succeeded */
if (status & 0x01) {
DEBUG(MTD_DEBUG_LEVEL0, "%s: Error status = 0x%08x\n",
__func__, status);
ret = -EIO;
}
return ret;
}
/**
* nand_unlock - [REPLACABLE] unlocks specified locked blockes
*
* @param mtd - mtd info
* @param ofs - offset to start unlock from
* @param len - length to unlock
*
* @return - unlock status
*/
int nand_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
{
int ret = 0;
int chipnr;
struct nand_chip *chip = mtd->priv;
DEBUG(MTD_DEBUG_LEVEL3, "%s: start = 0x%012llx, len = %llu\n",
__func__, (unsigned long long)ofs, len);
if (check_offs_len(mtd, ofs, len))
ret = -EINVAL;
/* Align to last block address if size addresses end of the device */
if (ofs + len == mtd->size)
len -= mtd->erasesize;
nand_get_device(chip, mtd, FL_UNLOCKING);
/* Shift to get chip number */
chipnr = ofs >> chip->chip_shift;
chip->select_chip(mtd, chipnr);
/* Check, if it is write protected */
if (nand_check_wp(mtd)) {
DEBUG(MTD_DEBUG_LEVEL0, "%s: Device is write protected!!!\n",
__func__);
ret = -EIO;
goto out;
}
ret = __nand_unlock(mtd, ofs, len, 0);
out:
/* de-select the NAND device */
chip->select_chip(mtd, -1);
nand_release_device(mtd);
return ret;
}
/**
* nand_lock - [REPLACABLE] locks all blockes present in the device
*
* @param mtd - mtd info
* @param ofs - offset to start unlock from
* @param len - length to unlock
*
* @return - lock status
*
* This feature is not support in many NAND parts. 'Micron' NAND parts
* do have this feature, but it allows only to lock all blocks not for
* specified range for block.
*
* Implementing 'lock' feature by making use of 'unlock', for now.
*/
int nand_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
{
int ret = 0;
int chipnr, status, page;
struct nand_chip *chip = mtd->priv;
DEBUG(MTD_DEBUG_LEVEL3, "%s: start = 0x%012llx, len = %llu\n",
__func__, (unsigned long long)ofs, len);
if (check_offs_len(mtd, ofs, len))
ret = -EINVAL;
nand_get_device(chip, mtd, FL_LOCKING);
/* Shift to get chip number */
chipnr = ofs >> chip->chip_shift;
chip->select_chip(mtd, chipnr);
/* Check, if it is write protected */
if (nand_check_wp(mtd)) {
DEBUG(MTD_DEBUG_LEVEL0, "%s: Device is write protected!!!\n",
__func__);
status = MTD_ERASE_FAILED;
ret = -EIO;
goto out;
}
/* Submit address of first page to lock */
page = ofs >> chip->page_shift;
chip->cmdfunc(mtd, NAND_CMD_LOCK, -1, page & chip->pagemask);
/* Call wait ready function */
status = chip->waitfunc(mtd, chip);
udelay(1000);
/* See if device thinks it succeeded */
if (status & 0x01) {
DEBUG(MTD_DEBUG_LEVEL0, "%s: Error status = 0x%08x\n",
__func__, status);
ret = -EIO;
goto out;
}
ret = __nand_unlock(mtd, ofs, len, 0x1);
out:
/* de-select the NAND device */
chip->select_chip(mtd, -1);
nand_release_device(mtd);
return ret;
}
/**
* nand_read_page_raw - [Intern] read raw page data without ecc
* @mtd: mtd info structure
@ -3089,6 +3251,8 @@ void nand_release(struct mtd_info *mtd)
kfree(chip->buffers);
}
EXPORT_SYMBOL_GPL(nand_lock);
EXPORT_SYMBOL_GPL(nand_unlock);
EXPORT_SYMBOL_GPL(nand_scan);
EXPORT_SYMBOL_GPL(nand_scan_ident);
EXPORT_SYMBOL_GPL(nand_scan_tail);

10
include/linux/mtd/nand.h
View File

@ -38,6 +38,12 @@ extern void nand_release (struct mtd_info *mtd);
/* Internal helper for board drivers which need to override command function */
extern void nand_wait_ready(struct mtd_info *mtd);
/* locks all blockes present in the device */
extern int nand_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
/* unlocks specified locked blockes */
extern int nand_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
/* The maximum number of NAND chips in an array */
#define NAND_MAX_CHIPS 8
@ -82,6 +88,10 @@ extern void nand_wait_ready(struct mtd_info *mtd);
#define NAND_CMD_ERASE2 0xd0
#define NAND_CMD_RESET 0xff
#define NAND_CMD_LOCK 0x2a
#define NAND_CMD_UNLOCK1 0x23
#define NAND_CMD_UNLOCK2 0x24
/* Extended commands for large page devices */
#define NAND_CMD_READSTART 0x30
#define NAND_CMD_RNDOUTSTART 0xE0